The IC-PTT plugs into the OPC-499 headset adapter. Approximately three feet long. Works with the ICOM IC-A22, IC-A3, IC-A4, IC-A5, IC-A23, IC-A6, and IC-A24. Activation occurs as long as the Red Button depicted is depressed with your finger creating a "Hot Mike". This comes with a Velcro-type straps allowing for easy attachment to your planes Control Wheel Yoke. Measures 3-Feet long. Works with the ICOM Radio IC A22, A3, A4, A5, A23, A6, and A24.